Paper-making machinery



' June 8 ,1926. 1,587,784 E.MAH| ER PAPER MAKING MACHINERY -f Filed May 4, 1925 ZNSheetS-Sheet 1 s Q QQS Q` l v HHHH 5 l Ila if N N .i a2;

u "Y r f N I* I w m w m 1 i Y S E E E f i gk 1 j I E E@ w l m mw 'IIHI I/ f Y MMIII' N liu/@NEW l-ns j( W June s 192s. 1,587,784

. E. MAHLER PAPER MAKING MACHINERYl Filed May 4, 1925 2 Sheets-Sheet 2 I 25 f 37 f i 1 Lz j@ ,j YR 36 j i I 'i l l 37 24 32' Patented Junev 8, 1926. v

UNITED STATES V1,587,784 PATENT OFFICE.

`:ERNST MAKLER, OF NEENABI, WISCONSIN, ASSIGNOR T0 PAPER PATENTS COMPANY,

OF NEENAI-I, WISCONSIN, A CORPORATION OF WISCONSIN. i

PAPER-MAKING MACHINERY.

Application led lay 4, 1925. Serial No. 27,724.

This invention relates to paper-making machinery but more particularly to calendering mechanism and has for its primary object to provide a simple, and efficient device for applying pressure to the rolls of a calendering stack.

F urther objects of my invention are to provide adequate and uniform pressure on the rolls, to facilitate the adjustment and release of the pressure, to eliminate the necessity for readjustment of the pressure after release, to prevent injury to the stack, and in general to provide a new and improved pressure device for a calendering stack.

The many other objects and advantages of my invention will be better understood by reference to the following specification when consideredA in connection with the accompanying drawings illustrating a. selected embodiment thereof, in Which:-

Fig. 1 is an end elevation of a calendering stack having incorporated therein a pressure device embodyingl the principles of my invention. n

Fig. 2 is a side elevation.

Fig. 3 is an enlarged elevation of a portion. of the pressure device.

Fig. 4 is a vertical sect-ion on of Fig. 3.

Fig. 5 is a top plan view of the portion of the mechanism shown in Fig. 3, and

Fig. 6 is a horizontal section on the line 6-6 of Fig. 4.

Referring to the drawings, the stack 10 the line s comprises the usual rolls 11 and end frames' 12. One of these rolls is driven by suitable gearing and the other rolls of the `stack are frictionally driven therefrom. The bearings 13 of the rolls 11 are vertically slidable in the frames 12. Only suiiicient mechanism of this stack has ben shown to enable the construction and mode of operation of my improved hydraulic pressure device to be readily understood as the stack is of the well-known super-calender type.

The weight of these rolls is generally insuiiicient to produce the proper glaze on the paper and it is customary in the art to apply additional pressure. tion, a hydraulic pressure mechanism is provided which acts upon the bearings of the upper roll. A lever as 14 is plvotally mounted at 15 on each of the end frames 12 and a pull rod as 16 is connected to the free outer end of this lever.l Vertically In the present invenmovable plungers as 17 act between the under faces of these levers and the corresponding bearings 13. As the mechanism for operating each of these pull rods is the same, only ,one will be described in detail.

The rod 16 preferably comprises two sections 18 and 19 connected by a turn buckle as 20 to permit the ,length of the rod to be adjusted.' This turn buckle is provided with a hand Wheel 21 to facilitate its operation. The lower extremity of the section 19 is pivotally connected to the hydraulic pressure device 22.

The present embodiment of my hydraulicv pressure device 22 includes a cylinder 24, the bottom end of which is pivotally connected to the end frame 12, so as to permit a limited swinging movement. Such pivotal vconnection comprises a pin .25 which passes through an apertured lug or extension 26 on the bottom of the cylinder and similar lugs 27, 27 on the end frame 12.v A head 28 is secured upon the cylinder by bolts 29 or other suitable means.

A piston 31 operates within the cylinder 24 and a piston rod 32 is attached to this piston. The downward travel of the piston within the cylinder -is limited by a stop 33 which in the present embodiment consists of cross ribs as 34 disposed at substantially a right angle and integral with the cylinder. A stuiing-box 36 of suitable type is mounted inthe cylinder head. Fluid under pressure is admitted to the cylinder through a port 37 which also acts as the exhaust. A pipe as 38 connects the ports 37 of the hydraulic devices at opposite ends of the stack and a pipe 39 communicates with this pipe 38. A three-way valve 40 isprovided to permit the pipe 39 to be selectively connected with the accumulator or source of supply of Huid under pressure or with a sewer or discharge outlet. For convenience, the piping has been illustrated as above the flooring and adjacent to the stack mechanism but in practice it is preferably located beneath such flooring and at a point more remote from the stack.

The lower section 19 of the pull rod 16 is connected to a cross-head by the pin 46 which passes through an eye47 on the rodk and eyes 48,l 48 on the cross-head. The cross-head is secured to the upper extremity of the piston rod 32, and is slidable on spaced vertical parallel guide posts 49, 49 fixed in wheel.

the piston down against' its stop, and results in a downward pull on the rods 16 depending in amount upon the adjustment of the hand The pressure actually exerted on the rolls of the stack is the pull on the rods 16 as multiplied by the leversl 14.

The pressure of the fluid in the accumulator is always more than sucient to force.

the piston against its vend. stop under all ordinary conditions of working.` Therefore, assuming that such pressure -is always maintained in the accumulator, the` adjustment of the pressure on the rolls vto suit varying conditions of operation will always be eie'cted by means of the turnbuckle controlled by the hand wheel 21. f Y A When it is desired to relieve they pressurel or super-pressureA which is applied to the stack through the pull rods 16, for. example at the beginning of arun or in case the paper breaks, the operator turns the valve 40 into the position where the cylinder is connected with the waste pipe instead of with the accumulator. Thus', there will be nothing holding the pistonagaist its end vstop' and the levers 14 L willbe free to rise. This per-- mits the paper to'be inserted between the rolls, which 4would not be vpossible if the super-pressure prevailed. f vIt will (be v observed that there is no necessity to adjust .or to re-adjust the hand wheels when starting the run or eifecti'nga paper change or repair, since the cylinderand its piston, in this respect, merely function as a quick detachable connection between the end lof the pull lrod 19 and the framelugs 27. A

In addition' to the advantage that-v4 the necessity of adjusting the hand wheels'aiter they have once been set to the proper pressure for the class of paper being operated upon, is eliminated, the improved hydraulic/- arrangement has another very important advantage. A It has been stated that at all timesY the pressure ofthe cylinden under normal operating conditions is more than suilicent rolls as it should,

operate at all times always to force the piston against its stop. Such pressure, however, is limited, or the piston area is limited, to provide a roll,pres sure which is insufficient to cause breakage of the roll journals lor other parts of the stack. Hence, the, hydraulic cylinder and piston as a safety device, and ofv passing through the if the paper instead wrapping around one of the rolls, they rise in pressure due to the increasingdiameter of` the paper covered roll would be' arrested as art. For example, instead of making sa1d frame,

member may be extended or will, and separate means for adjusting said member whereby pressure on the rolls mayA shouldhappen -to stflrt soon as a certain fixed amount had beenv exceeded. Thereafter, the increase in diameter ofthe roll would merely cause the pistons to rise in the cylinders and force the hydraulic fluid back into the accumulator.

The advantages of this hydraulic arrangement will be manifest to` those skilled in the it necessary to run the rolls slowly at the start o'f the operation while theL pressure is being laboriouslyrestored to the correct amount for the job in hand, with my apparatus the pressure is restored to its proper amount instantaneously by the mere -turning of the valve to its correct position and the rolls may be put into full speed operation at once. Not only does this effect a saving in man power, conserve time and hence increase the output, but also spoilage ofa large amount of paper at the commencement of a run, 'or after a change, is almost entirely eliminated. Furthermore, because'of the fact that the desired calendering pressure maybe secured without necessity of adjusting the hydraulic pressure or of changing'weights, the operators are enabled* to secure a productv having the proper finish.

Since the described details o f construction and operation are illustrative of merely one A 95: determined by selected embodiment 'of my invention, the scope of the same should be reference to theF appended claims, said claims being construed as broadly as possible consistent with the'state of the art.

I claim as my invention:

1. In paper finishing apparatus, the combination of a stack of calenderI rolls, a connection for applying pressure to said rolls,

high `grade means for -adjusting said connection to vary l said pressure, anda hydraulic device inter- *posed in said connection, whereby said pressure may be relieved at will.

2. In paper finishing apparatus the com.- bination o a frame, a stack of calender rolls mounted in said frame, a member for applying pressure to said rolls 4and connected to said frame, means' for adjusting said member to vary said pressure and. sai connection including a hydraulic cylinder and piston, `whereby said member may` be extenled or contracted at will.

3. n bination of a frame,a stack of calender'rollsr mounted in saideframe, a member'for ap lyingpressure to said rolls and connected to said connection including a hydraulic cylinder and piston, contracted at be varied. f

'l 4. In bombination, a frame, a stack of calender rolls `mounted in said frame, a

preps/sur'e-applying member, a pressure multivplymg device connected between said mem paper finishing apparatus, the comwhereby said ber and said rolls and operative to apply pressure to said rolls, a, turnbuckle arrangement in said vmember for adjusting -the length thereof, a cylinder 4element and a piston element, said elements being respectively connected to the frame and to said.

member, and means for supplying said cylinder with pressure to act on said member to make the latter eli'ective to apply pressure lto said rolls.

5. In combination, a frame, a stack of calender rolls mounted in said frame, a pressure-applying member, a pressure multiplying device connected between said member and said `rolls and operative to apply pressure to said rolls, means for varying the pressure applied to said rolls, a cylinder element and a piston element, said elements being respectively connected to the frame and to said member, a sto element means for supplymg said cylinder with sulicient pressure to force said piston against said stop, and to' acton said member to make the latter elfective to apply pressure to said rolls, and means for relieving the pressure of said fluid to remove the pressure from said rolls.

yprising two relatively adjustable parts maximum or vice versa.

.a frame, a stack of for said piston .l

whereby the length of said member may be manually varied, and the normal pressure adjuste 7. In combination, aframe, .a stack of calender rolls mounted in said frame, a

pressure multiplying lever vco-acting with f said stack orapplying pressure thereto, a link train connecting the end 4of said lever with said frame andincluding a manually adjustable length-varying arrangement for changing. orvarying the ressure .on vsaid roll to suit dilerent conditions and also `including a piston and cylinder constituting a `hydrauliclinkfor changing the pressure apvplied to said link frame from zero to a 8. In combination, y calender rolls mounted in said frame, and

a chain of connections for applying superpressure to said rolls, said chain including a screw connection whereby the pressure may be adjusted 4to the pro er desired amount and also including ahy raulic cylinder and a piston, whereby the desired pressure may be instantaneously relieved orapplied.-

' 9. In combination, a vframe, a stack of* calender rolls mounted in 'said frame, 'and a chain of connections for applying superpressure to said rolls, said chain including a screw .connection whereby the pressure may be adjusted to the proper desiredamount and also including a hydraulic clinder, a` l i piston and a sto c therefor, the rela ive movement of said kplstonand said 'cylinderV in a direction to increase the .pressure being normally prevented by said stop and-whereby thedesired pressure may be instantaneously relieved or applied and constituting a safety device for yielding when the pressure accidently exceeds a denit'e amount. f

ERNST MAHLER. 

